Two Sedans with more similarities, such as the body structure, ground shadow size, height, and maximum occupancy, than differences, like the market segment, starting price, horsepower, and fuel economy. First of all, there is a $3,490 difference in the base MSRP. The 2015 Kia Optima Hybrid has a higher starting price than the 2016 Nissan Altima. Also, the 2016 Altima has bigger and thirstier engine; the 2015 Optima Hybrid gets 8.5 more mpg. Among similarities are the body structure, ground shadow size, height, and maximum occupancy.